List users in a specific realm
AI agents call list-users to retrieve information from Advanced Keycloak MCP server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves user information from a Keycloak realm without creating, modifying, or deleting data. It is a read-only operation. Severity is medium rather than low because user listings in an identity management system could expose sensitive information about user accounts, organizational structure, or authentication endpoints if accessed by an unauthorized AI agent, though the blast radius is…
From the tool's definition Tool name 'list-users' and description 'List users in a specific realm' indicate retrieval of user data with no modification.
Attacks that exploit this kind of access
List users in a specific realm. It is categorised as a Read tool in the Advanced Keycloak MCP server MCP Server, which means it retrieves data without modifying state.
Register the Advanced Keycloak MCP server MCP server in PolicyLayer and add a rule for list-users: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Advanced Keycloak MCP server. Nothing to install.
list-users is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the list-users rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for list-users. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
list-users is provided by the Advanced Keycloak MCP server MCP server (octodet/keycloak-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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